铠甲动物门(Loricifera)是生活在海洋中的一个门，这个门在1983年被莱因霍尔德发现。这种动物有头，嘴和消化系统，没有循环系统和内分泌系统。是假体腔动物（有嘴和肛门的动物）雌雄同体，卵生。没有化石。2010年发现该门有无氧呼吸的物种。发育中经过一独特的Higgins幼虫，很像成体，但它有一对趾用于运动。

它们的近亲是动吻动物门和鳃曳动物门。目前没有准确分类。
种类：

Loricifera (from Latin, lorica, corselet (armour) + ferre, to bear) is a phylum of very small to microscopic marine sediment-dwelling animals with twenty-two described species, in eight genera. Aside from these described species, there are approximately 100 more that have been collected and not yet described. Their sizes range from 100 µm to ca. 1 mm. They are characterised by a protective outer case called a lorica and their habitat, which is in the spaces between marine gravel to which they attach themselves. The phylum was discovered in 1983 by Roberto Ramos, in Roscoff, France. They are among the most recently discovered groups of Metazoans. They attach themselves quite firmly to the substrate, and hence remained undiscovered for so long. The first specimen was collected in the 1970s, and later described in 1983. They are found at all depths, in different sediment types, and in all latitudes.